diff --git a/src/main/java/org/springframework/data/elasticsearch/client/elc/TypeUtils.java b/src/main/java/org/springframework/data/elasticsearch/client/elc/TypeUtils.java
index 43747f3a7..5ff327297 100644
--- a/src/main/java/org/springframework/data/elasticsearch/client/elc/TypeUtils.java
+++ b/src/main/java/org/springframework/data/elasticsearch/client/elc/TypeUtils.java
@@ -436,7 +436,7 @@ final class TypeUtils {
 		// values taken from the RHLC implementation
 		if (value == null) {
 			return -2;
-		} else if ("all".equals(value.toUpperCase())) {
+		} else if ("all".equals(value.toLowerCase())) {
 			return -1;
 		} else {
 			try {